Tubing connector identification requestThanks, but I don't believe these are Luer fittings - as I understand it they are some type of compression fitting, you can push the teflon tubing through to the desired length, then screw tighten the fitting to seal it in place.

How to prevent protein precipitation?Is there a standard technique to get around this? I guess I could dilute a bunch, adjust pH then reconcentrate? Or would I be better off just looking for another labeling chemistry?